Alternating-current commutator-motor.



F. W. MEYER.

ALTERNATING CURRENT COMMUTATOR MOTOR.

APPLICATION FILED JAN. H, 1913.

Patented Feb. 8, 1916.

2 SHEETS-SHEET I.

INVENTOR A-TTORNEY WITNESSES:

F. w. MEYER.

ALTERNATING CURRENT COMMUTATOR MOTOR. APPLICATION FILED JAN. 11. 1913.

1., 170,657. Patented Feb. 8, 1916.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

FRIEDRICH w. MEYER, or wILKINsBURe, PENNSYLVANIA, ASSIGNOR r0 WESTING-HOUSE ELECTRIC AND mANUFAc'rUmNe COMPANY, A conronA'rIoN or rENNsyn-VANIA.

ALTERNATING-CURREN '1 COMMUTATOR-MOTOR.

Specification of Letters Patent.

Patented Feb. 8, 1916.

To all whom it may concern:

Be it known that I, Fnrsonrcn W. MnYsn, a subject of the Emperor ofGermany, and a resident of Wilkinsbur in the county of Allegheny andState of invented a new and useful Improvement 1n Alternating -CurrentCommutator Motors, of which the following is a specification.

My invention relates to polyphase alter:

- nating, current commutator motors, and it has for its object toprovide a motor of this character, the speed and power factor of whichmay be separately-regulated without causing material distortion of therotating field form from a sine wave.

In another application Serial No. 653,380, filed October 7, 1911, I havedisclosed and covered a polyphase commutator motor in which the numberof active convolutions 1n the several phase divisions of the fieldwind-.

ing, and the positions thereof relatively to the stator and commutatorbrushes, may be separately adjusted for the purpose of regulating thespeed and :power factor respectively of the motor.- I

The present invention is an-improvement over that set forth in the saidapplication, and provides simple and effective means. whereby thedirectionsand magnitudes of, and the phase angles between, the vectorsrepresenting the voltages .apphed respectively to the stator andarmature-may beture ,1 having a winding t at is connected in the usualmanner to the segments of a commutator cylinder 2 upon .w ich brushes3,:bear. -Thearmatnreis.sprrounded by a, stator or'field member that isprovided with twowindings 4; and 5, that, for the sake of.

simplicity and clearness of illustratiomare here shown as arranged sideby side. but which. in a practical structure, will be placed upon thesame magnetizable core member ennsylvania, have so as to be inductivelyrelated. In order to further simplify the illustration of the invention,and to thereby facilitate an understanding thereof, the stator windingsare shown in Figs. 1 and 2 as of the ring type, but the invention mayalso, andpreferably wlll, be employed in connection with windmgs of thedrum type, as shown in Fig. 3. The two stator windings are' preferablysimilar and are in the form of progressive lap and wave windings,alternate coils of which are respectivelyconnected to the segments oftwo stationary commutatorcylinders fi and 7. The segments of thecommutator cylinder (3 are connected to the coils of the stator winding4 without opening any of the coils except. three (8) that are e uallyspaced apart and the ,two' parts 0 .WlilCh are connected toadjacent'commutator segments. The openings in the said oolls' serve to.fix the positionsvof the several'phase divisions of the stator'winding,The commutator ylinder 6 is engaged by three pairs of-brushes 9 and 10respectively, the members ofeach pair being connected together, and",the pairs being respectively connected'to' the conductors of a suitablesupplycircuit. 12. The brushes 9 and 10 may be rotated without changingtheir relative positions,,in.whic h case only the.,positions of.theactive portions of the several phase divisions of the winding will bechanged.- -However, if the brushes 9 and 10 are caused to approach orseparate, the numbers of active convolutions in the several phasedivisions of the stator winding will be changed.

The stationary commutator cylinder 7 differs from the commutator 6 inthat it is provided with a larger number of segments, and the statorwinding 5 clifi'ers from the winding 4 in that alternate coils areopened and the two parts thereof are respectively connected to adjacentcommutator segments. The commutator cylinder 7 is engaged by three pairsof brushes 13 and. 14, the members of each pair of which mavbe connectedtogether and the pairs respectively connected to the commutator brushes3, as shown in Fig. 1, or, if desired, the brushes 1.3 may all beconnected together,-and the brushes 14 respectively connected to thearmature brushes 8. asshown in Fig. 2. In the former ease. the severalphase divisions of the winding are connected in delta relation. and, inthe latter case, they are connected in star relation, The commutatorcylinder- 7 is also engaged by a set of. brushes 15 that are adapted toelectrically connect adjacent commutator segments for the purpose ofconnecting the several coils of the winding in series relatiom. In thiscase, there are,

three less than enough brushes to span alternate spaces between thecommutator segments, in order to thereby provide for disconnectionbetween the several phase divisions of the winding. If the brushes 13'and 14" are rotated without changing their relative positionsandwithout' changingthe positions ofthe active portions of' the statorwinding 5 will be corres ondingly rotated', and if the" -14' are*'moved*toward or away. from each other, while maintainin positions of thebrushes 15", the

brushes 13 an the"?brushes 1 5 stationary, thenumbers 0 activeconvolutions in the stator winding 5 willbe' regulated. In" theserespects, the stator winding 5 and commutator cylinder 7,and the brushes13 a'nd'14 have the same" functions as the corresponding partsassociated with' the winding 4; However, the brushes 15 that engage thecommutator cylinder'7 provide additional means for regulating thepositions of the active portions It can be understood that theregulationof tliemachine' may, if 'desired, be effected by either or both of theregulators sho'wnin ca'ses'it'may be found desirable to employ aregulator'in connection with only one of the stator windings.

Since the numbers of active convolutions of the several hasedivisions-of each stator winding and tie positions thereof'r'elativelyto the stator itse f and to each other, may be scpa'ratelyregulated, itis obvious that the present invention rovides means whereby thedirections an the phase angles between, the vectorsrepresenting thevoltages applied to thestator andarmature may to'afiect speed regulationof the motor and to cause its ower'factor to assume substantiall' any'.of 't especial ar'ran 'em'ent' of the windings Vi employed, this 'reguation may' be effected. without material y distorting the form "ofth'o'rotatin field from a sine wave vThe 'win' mg shown 'inFig. 8,ISOf'iZh'OI" dinary-' lap' and wave drum type such asis commonlyemployed upon thearm'atur'es of electrical machines, and it is connectedto comprisin magnitudes of, and

e conveniently adjusted esired value, and that-because the stationarycommutator in the same manner as the windings of Figs. 1 and This willbe clearly understood from an examination of Fig. 3.

The present form of winding and regulator may, of course, be a aplied bythose skilled inv the art to machines having substantially any desiredcharacteristics, such as of shunt, series and compound machines.

If the armature of the present motor is connected directly to the supplycircuit, it is necessary to employ only one stator winding wlii'ch'willalso be connected to the supply circuit and may be employed forregua'ting both the speed and power factor of the motor.

I claim as my invention:

1. Am alternating current commutator motor comprising aplurality ofinductively related'lap and wave stator windings, an armature having" a.commutator cylinder, brushes'bearing on the commutator cylinderand'adjustably connected to one of said field windings.

2. An alternating current commutator motor-comprising a plurality ofinductively related"-lap"a-nd" wave stator windings, an armature havinga commutator cylinder, brushes bearingon-the commutator c lindcr, and'means foradjustably connectin the said brushestoalternate coils of oneor said stator windings; I

3'; An alternating current commutator motor comprisinga plurality'ofinductively related lap and wave stator windings, each a; pluralityof hase divisions, an ar'mature't atisa'djustab y connected to one ofsaid windings, and means for adjusting the relative'positions'of thecorres )onding I p vphase divisions of the said stator windings.connection with Fig. '1,and'that,1n some- An alternating currentcommutator motor comprising a plurality of inductivel related lapand'wave stator windings, eac comprising a plurality of base divisions,an armature t iat is connecte to one of the said stator windings, andmeans -for adj ustim the numbers of active convolutions in, anc the"relative positions of, the corresponding phase divisions of the saidwindings.

5*. The combination with an alternating current supply circuit, of amotor comprismg electrically unconnected but inductively re ated primaryand secondary stator windlngs, the primary winding of which is connectedtothe su ply circuit, an armature that' 1s connects to the secondarystator winding, and means for adjusting the relatwo positions of theactive portions of the several phasedivisions of the said windings.

6. An alternating current commutator motor comprising a. lap and wavestator windin'gta commutator connected to alterhave coils of saidwinding, and relatively movable brushes engaging said commutator. 7. Analternating current commutator motor comprising a progressive statorWinding, a commutator connected to said Winding, and tWo sets of brushesengaging said commutator and movable relatively thereto,

one set being adapted to span alternate spaces between adjacentcommutator segments' 8. An alternating current commutator motorcomprising a progressive stator Winding, a commutator connected to saidWinding, and two sets of brushes engaging said

